Purity >98%. 11(Z),14(Z),17(Z)-Eicosatrienoic acid is a rare Omega-3 PUFA in normal humans. However, it is one of the most active essential fatty acids when assayed for the inhibition of fatty acid elongation/desaturation reactions which convert dietary C-18 fatty acids to C-20 eicosanoid precursors. 11(Z),14(Z),17(Z)-Eicosatrienoic acid methyl ester is an ester version of the free acid that may be more amenable for the formulation of fatty acid-containing diets and dietary supplements.